My name is ***** ***** I'd be happy to answer your questions today.
To get a warrant for surveillance, a police officer must produce a sworn affidavit, supported by probable cause to believe that evidence of a crime will be found at the place he's asking to search. An affidavit may be based on hearsay (and usually is). However, to get a conviction in court, the prosecution would need witnesses to appear and testify as to things they personally observed - hearsay isn't enough to support a conviction.
A person who is charged with a crime has a right to request a copy of the affidavit and can move to suppress evidence if the affidavit isn't enough to establish probable cause.
There's no law about how frequently planes or helicopters could pass over a person's home. However, if planes and helicopters are constantly overhead causing a nuisance, it may be possible to file a complaint with the police department. That doesn't necessarily affect the admissibility of any evidence found using those planes and helicopters.
If the warrant is valid, evidence from video taken by a drone is admissible in court. A defendant can seek to dispute the chain of custody
of the video to make sure it wasn't tampered with or that it's otherwise not a video of the defendant's home or business and is therefore unreliable evidence.
If you have any questions or concerns about what I've written, please reply without rating so I may address them. It's important that you are 100% satisfied with my courtesy and professionalism. Otherwise, please rate my service positively to redirect a portion of the payment you have already made so I am paid for the time I spend answering questions. There is no charge for follow-up questions. Thank you.